Having a bit of a nightmare with my ex-husband agreeing a timetable for the children over the holidays (mainly Summer and Christmas).
Our situation is more complicated he has main custody of DD for 5 nights and I have main custody of DS for 5 nights in term time (they are both with him Friday night and Saturday day then swap to me on Saturday evening until Monday morning).
I used to do a spreadsheet in December for the following year so we could arrange holidays and childcare. All was fine as he didn't mind and didn't want to do it himself.
He now has a partner who has 2 DC and has started to provide me with HER spreadsheet so it aligns with when her children go to their DF's and they can have "childfree time" as she doesn't work in school holidays.
I've been flexible- I've swapped every week in summer and Easter over to accommodate them. He knows Christmas Eve is a dealbreaker for me as we always do the same thing with family. But he also wants me to have them Boxing Day and over new year so we'd be swapping over 6 times in 2 weeks which seems excessive to me.
But there's some dates I don't want to swap- I've told him no and he's laying it on thick that it's SOOO hard for them to align it all. Yet she hasn't made any adjustments to her schedule and they don't even live together.